The correct answer is option 1: 1 and 3.

Statement 1 states that diamond is hard and graphite is soft. This is true and can be explained by the difference in the structures of diamond and graphite. Diamond has a three-dimensional lattice structure with strong covalent bonds between carbon atoms, making it extremely hard. On the other hand, graphite has a layered structure with weak van der Waals forces between the layers, which allows the layers to slide over each other easily, making it soft.

Statement 3 states that diamond is a bad conductor, but graphite is a good conductor. This is also true. Diamond is an insulator because its strong covalent bonds prevent the movement of electrons. On the other hand, graphite is a good conductor of electricity because it has delocalized electrons that can move freely within the layers.

Option 2: Only statement 1 is incorrect because it states that diamond is soft and graphite is hard, which is the opposite of the correct answer.

Option 3: Statement 2 is incorrect because it states that diamond is soft and graphite is hard, which is the opposite of the correct answer.

Option 4: Statement 4 is incorrect because it states that diamond is a good conductor and graphite is a bad